Plo Koon from the Power of the Jedi line has a yellow saber (although it does look somewhat green in the right lighting). At the time he had a yellow saber in the comics--this was before he had a blue one in AOTC.

Saesee Tiin and Ki Adi had purple sabers before AOTC came out and Mace had blue. Adi Gallia was made with a ruby saber, while Plo had yellow. This was all based on Dark Horse comics Emmisaries of Malastare and Outlander, I believe.